FIBER OPTIC CONNECTOR WITH OVERMOLDED INLET TUBE.

Abstract

This description refers to a fiber optic connector designed to improve the insertion of an optical fiber into the fiber optic connector. The fiber optic connector may include an entry tube that facilitates fiber insertion. Specifically, the entry tube can be molded onto a ferrule connector to completely encapsulate one rear end, preventing the optical fiber from snagging or dangling during insertion.

Description

FIBER OPTIC CONNECTOR WITH OVERMOLDED INLET TUBE ri bb7n / 7?n7 / =i / Yl· CROSS REFERENCE TO RELATED APPLICATION This application is filed on July 14, 2020 as an international PCT patent application and claims the benefit of US patent application serial no. 62 / 875,332, filed on July 17, 2019, the description of which is incorporated herein by reference in its entirety. TECHNICAL FIELD The description refers to fiber optic connectors for use in fiber optic signal transmission systems and, more particularly, to an overmolded inlet tube. BACKGROUND OF THE INVENTION Fiber optic communication systems are becoming increasingly common, in part because service providers want to offer high-bandwidth communication capabilities (e.g., data and voice) to customers. Fiber optic communication systems use a network of fiber optic cables to transmit large volumes of data and voice signals over relatively long distances. Fiber optic connectors are an important part of most fiber optic communication systems. Fiber optic connectors allow two optical fibers to be quickly and easily connected without splicing. Fiber optic connectors can be used to optically interconnect two lengths of optical fiber. Fiber optic connectors can also be used to interconnect lengths of optical fiber with passive and active equipment. Fiber optic connectors can include single-fiber connectors and multi-fiber connectors.When two fiber optic connectors are interconnected, their respective optical fibers align coaxially so that the fiber ends face directly opposite each other. In this way, an optical signal can be transmitted from fiber to fiber through the aligned ends of the optical fibers. Entry tubes can be used in fiber optic connectors to facilitate epoxy insertion. Entry tubes can also be useful for fiber insertion. Improvements to entry tube design are desirable. BRIEF DESCRIPTION OF THE INVENTION Aspects of this description relate to a fiber optic connector designed to improve the insertion of an optical fiber into the fiber optic connector. In certain applications, an optical fiber may encounter obstructions during insertion into a fiber optic connector, hindering proper insertion. For example, exposed ridges on an entry tube, ferrule, and connector can interfere with and stop the optical fiber's advance. Such interference can also cause damage to the optical fiber. The inlet tubes also help prevent epoxy migration or placement of epoxy in unwanted locations outside the area where the optical fiber joins the fiber optic connector ferrule, such as in the connector spring area. One aspect of this description relates to a fiber optic connector designed with an entry tube that facilitates the insertion of an optical fiber. The entry tube can be molded onto a ferrule connector to completely encapsulate one rear end of the connector so that the optical fiber does not snag or hang during insertion. In certain examples, the overmolded inlet tube tapers to zero along a tapered internal surface portion of a ferrule connector. The fiber optic connector preferably includes an overmolded inlet tube constructed of a flexible plastic material that is more flexible than the connector. The fiber optic connector can be an SC type fiber optic connector or an LC type fiber optic connector. The fiber optic connector in one example may have the overmolded inlet tube tapered to zero along a tapered inner surface portion of the connector and define a needle closure zone on the descending tapered inner surface of the location where the inlet tube tapers to zero. The fiber optic connector in one example may have an overmolded retaining member. In one example, the retaining member is defined by a circumferentially extending member, preferably a spigot. The fiber optic connector in one example may have an overmolded inlet tube tapered to zero along a tapered internal surface portion of the connector, and the same tapered internal surface of the connector may define a mold pin closure zone that forms the zero taper and a pin closure zone on the downward tapered internal surface of the location where the inlet tube tapers to zero. A tapered portion of the ferrule connector's inner surface may have an angle of 20 degrees or less relative to the centerline of a fiber optic connector. In some examples, the taper is 10 degrees or less, as for an SC connector. In some examples, the taper is 6 degrees or less, as for an SC connector. In one example, an SC connector with a 5.5-degree angle is provided. In some examples, the taper is 16 degrees or less, as for an LC connector. In one example, an LC connector with a 15-degree angle is provided. In certain examples, the overmolded inlet tube may have an inside taper angle of less than 5 degrees relative to the central axis, and in some cases 1 degree or less. £ I bb7n / 77n7 / =l / Yl· The following description will set forth a variety of additional aspects. These aspects relate to individual features and combinations of features. It should be understood that both the preceding general description and the detailed description that follows are merely illustrative and explanatory and do not restrict the broad inventive concepts upon which the modalities described herein are based. BRIEF DESCRIPTION OF THE FIGURES The accompanying figures, which are incorporated into and form part of the description, illustrate various aspects of this description. The following is a brief description of the figures: Figure 1 is a perspective front view of an illustrative fiber optic connector including a ferrule and connector according to the principles of the present description; Figure 2 is a rear perspective view of the fiber optic connector in Figure 1; Figure 3 is a top view of the fiber optic connector from Figure 1; Figure 4 is a side view of the fiber optic connector in Figure 1; Figure 5 is an exploded perspective view of the fiber optic connector in Figure 1; Figure 6 is an exploded cross-sectional view of the fiber optic connector in Figure 4; Figure 7 is a cross-sectional view of the fiber optic connector in Figure 3; Figure 8 is an enlarged view of a portion of Figure 7; Figure 8A is an even more magnified view of a portion of Figure 7; Figure 9 is a cross-sectional view of the fiber optic connector of Figure 3 and includes a fiber optic cable inserted into an internal passage through the ferrule; Figure 10 is an enlarged view of a portion of Figure 9; Figure 10A is an even more magnified view of a portion of Figure 9; Figure 11 is a perspective front view of another illustrative fiber optic connector in accordance with the principles of the present description; Figure 12 is a rear perspective view of the fiber optic connector in Figure 11; Figure 13 is a side view of the fiber optic connector in Figure 11; Figure 14 is an exploded view of the fiber optic connector in Figure 12; Figure 15 is a cross-sectional side view of the fiber optic connector in Figure 14; Figure 16 is a rear view of a splint connector including a splint in accordance with the principles of the present description; Figure 17 is a side view of the splint connector and splint of Figure 16; Figure 18 is a cross-sectional view of the splint connector and splint of Figure 17; Figure 19 is a cross-sectional view of the fiber optic connector of Figure 13, which includes a fiber optic cable; Figure 20 is an enlarged view of a portion of the fiber optic connector in Figure 19; Figure 21 is an enlarged view of a portion of the fiber optic connector in Figure 20; Figure 22 is a cross-sectional view of the fiber optic connector of Figure 19 without the fiber optic cable; Figure 23 is an enlarged view of a portion of the fiber optic connector in Figure 22; Figure 24 is an exploded perspective view of the splint connector and splint including an epoxy tube for the connector of Figure 11 according to the principles of the description; Figure 25 is a side view of the splint connector and splint including the epoxy tube of Figure 24; Figure 26 is a cross-sectional view of the splint connector, splint and epoxy tube of Figure 25; Figure 27 is a perspective view of the splint connector, the splint and the epoxy tube of Figure 25; Figure 28 is a cross-sectional view of the splint connector, splint and epoxy tube of Figure 27; Figure 29 is a cross-sectional view through a bare glass portion of an optical fiber from the optical fiber cable; and Figure 30 is a cross-sectional view through a coated portion of the optical fiber. DETAILED DESCRIPTION OF THE INVENTION The aspects of this description will be described in more detail below with reference to the accompanying figures, which show illustrative embodiments. However, this description can be embodied in many different ways and should not be interpreted as limited to the embodiments set forth herein; rather, these embodiments are provided so that this description is exhaustive and complete, and fully conveys the scope of the invention to those skilled in the art. With reference to Figures 1-10, an example of a fiber optic connector 10 is shown, which includes a fiber optic ferrule 12 and a connector 14. The connector 14 is shown mounted on the fiber optic ferrule 12 of the fiber optic connector 10. In certain examples, the connector 14 is a plastic material that is overmolded onto the fiber optic ferrule 12. The fiber optic ferrule 12 and the connector 14 can be secured together by convenient methods, including adhesive or snap-fit ​​mounting. The fiber optic ferrule and connector 14 are mounted inside a housing of the connector 16, shown in Figures 5-6. In the illustrated example, the connector housing 16 is an SC-type connector housing, and the fiber optic connector 10 is an SC-type fiber optic connector. In other examples, the fiber optic connector 10 may be one of a variety of well-known connector types, including LC as illustrated in Figure 11, and others. The fiber optic ferrule 12 includes a body 18 with a first end 20 that defines a ferrule tip. The body 18 of the fiber optic ferrule 12 includes an opposite end 22 received in a cavity 24 of the connector 14. The fiber optic ferrule 12 includes a central shaft 26. The first end 20 of the fiber optic ferrule 12 is typically polished together with the fiber after installation. The body 18 of the fiber optic ferrule 12 is typically made of ceramic, although alternatives are possible. In other embodiments, the ferrule 12 and connector 14 may be made of Ultem, thermoplastic materials such as polyphenylene sulfide (PPS), other engineering plastics, or various metals. Other materials and molding processes may be used. In other examples, the fiber optic ferrule 12 may be made of metal. The fiber optic ferrule 12 includes a central passage 28 concentric with the central axis 26. The central passage 28 extends from the first end 20 to the opposite second end 22. The central passage 28 includes a first portion 30 having a first diameter, an intermediate or second portion 32 having a second diameter, and a rear or third portion 34. The first portion 30 is sized to receive an inner fiber sized to 125 microns. The second portion 32 is sized to receive a portion of a fiber optic cable that includes an outer coating of 250 microns. That is, the fiber optic ferrule 12 includes dual-diameter portions 30 and 32, each specially sized to receive an inner fiber (125 microns) and a portion of an outer coating (250 microns), respectively. The third portion 34 tapers inward from the opposite end 22 to facilitate fiber insertion during installation. The third portion 34 may include a transition area extending from a first end 102 (see Figure 8) adjacent to the second portion 32 to a second end 104 (see Figure 8) adjacent to the second end 22 of the fiber optic ferrule 12 adjacent to the first end of hole 90 (see Figure 8) of a section of the upper hole 88 of the connector 14. The transition area has an internal diameter ID that changes continuously between the first end 102 and the second end 104. Although a single-fiber ferrule is illustrated, the aspects of this description are also applicable to multi-fiber ferrules such as MT ferrules and MPO ferrules. A typical multi-fiber ferrule is generally rectangular in shape and can support a plurality of optical fibers supported in one or more rows by the multi-fiber ferrule. With reference to Figures 9 and 10, an optical fiber cable 36 is shown with an inner fiber 38, an outer coating 40, and a buffer layer 42. The inner fiber 38 terminates at an end 44. Typically, end 44 is removed and polished with the first end 20 of the optical fiber ferrule 12. The outer coating 40 terminates at end 46. The buffer layer 42 terminates at end 48. The optical fiber ferrule 12 closely surrounds the inner fiber 38 and the outer coating 40. Epoxy is used within the central passage 28 to adhesively bond the optical fiber cable 36 to the optical fiber ferrule 12. In the optical fiber ferrule 12, the first portion 30 has a first dimension D1 (see Figure 8) large enough to accommodate the uncoated fiber, but not large enough to accommodate the coated fiber. The second portion 32 has a second dimension D2 (see Figure 8) large enough to accommodate the coated fiber, but not large enough to accommodate the buffer. In certain examples, the first portion 30 is cylindrical in shape and size, measuring 0.1255 mm ± 0.0015 mm, to accommodate the inner fiber 38, which is sized to 125 microns. The second portion 32 is cylindrical in shape and measures 0.260 mm ± 0.010 mm to accommodate the portion of the cable that includes the outer jacket 40, which is 250 microns in size. A preferred range for the second portion 32 is greater than 250 microns and less than or equal to 500 microns. A more preferred range for the second portion 32 is greater than 250 microns and less than or equal to 300 microns. The buffer layer 42 may have an outer diameter of, for example, approximately 900 microns and also protects the fiber. Although a single optical fiber is illustrated, it will be seen that more than one optical fiber can be placed within the buffer layer, such as two, four, eight, or even up to twenty-four optical fibers. The optical fiber can be loosely placed within the buffer layer to provide a "loose tube" arrangement or it can be placed to provide a "tight tube" arrangement. The 36 optical fiber cable may include a plurality of internal strength members. In one example, the plurality of strength members are fibers or yarns that completely surround the buffer layer 42. The yarns may be made of aramid fibers, such as those sold under the Kevlar trademark. In certain examples, the 36 optical fiber cable includes at least one rigid strength member within the inner core. As illustrated in Figures 5-6, the optical fiber connector 10 may further include a release sleeve 50, a spring 52, a back housing 54, a locking sleeve 56, and a cable strain relief member 58 (e.g., a structure limiting the fiber bend radius). The back housing 54 is mated to the connector housing 16 (e.g., by means of a snap-fit ​​connection). The optical fiber ferrule 12, the connector 14, and the spring 52 are captured between the connector housing 16 and the back housing 54. The optical fiber connector 10 is configured to mate with one end of the optical fiber cable 36. The back housing 54 includes a cable anchoring region 60 to which strength members (e.g., aramid yarn, fiberglass yarn, etc.) can be secured. The cable strain relief member 58 is mounted at the interface between the fiber optic cable 36 and the rear housing 54. The release sleeve 50 has a limited range of axial movement relative to the connector housing 16 and is configured to facilitate the release of the connector housing 16 from a fiber optic adapter. The release sleeve 50 is free to slide back and forth in distal and proximal directions relative to the connector housing 16 along the central axis 26 between a locked and a released position. For example, once the fiber optic connector 10 has been inserted into the port of a fiber optic adapter, the release sleeve 50 can be retracted relative to the connector housing 16 to disengage the fiber optic adapter grips from the corresponding shoulders 62 on the connector body, thereby allowing the fiber optic connector 20 to be removed from the adapter.It will be appreciated that the aspects of this description are also applicable to other types of fiber optic connectors such as LC style connectors, as well as other types of fiber optic connectors. Spring 52 functions to deflect the fiber optic ferrule 12 forward. Epoxy in this area can cause the connector to lock. When the fiber optic ferrule 12 is at least partially mounted inside the connector housing 16, the first end 20 of the fiber optic ferrule 12 is accessible at a plug end 64 (see Figure 6) of the connector housing 16. The release sleeve 50 includes a key 66 (see Figure 2) that defines a tight position for the fiber optic connector 10. The cable strain relief member 58 functions to provide fiber bend radius protection to the fiber optic cable 30 at the interface between the fiber optic cable 36 and the fiber optic connector 10. The engagement sleeve 56 can be used to engage the cable strength members to the cable anchoring region 60. That is, once the fiber insertion process is complete, the engagement sleeve 56 is slid forward over the cable anchoring region 60 of the back housing 54 and used to engage the front end of the strength member layer around the outer surface of the cable anchoring region 60 of the back housing 54. The cable strain relief member 58 is then slid forward over the engagement sleeve 56 and the cable anchoring region 60 of the back housing 54. To provide an effective optical connection between two fiber optic connectors, it is desirable that the fibers of the connected fiber optic connectors be precisely aligned coaxially so that the cores of the optical fibers are coaxially aligned with each other. In this regard, the central passages 28 of the fiber optic ferrules 12 are precisely oriented. Returning to Figure 5, the connector 14 may include a first end 68 and a second end 70 such that the first end 68 of the connector 14 is configured to mount onto the second end 22 of the fiber optic ferrule 12. As illustrated in Figures 8 and 10, the second end 70 of the connector 14 may include a stem portion 72 extending in a direction toward the rear housing 54 and terminating at a termination end 74. In certain examples, the stem portion 72 may include a slanted flange portion or spigot 76 extending radially outward adjacent to the termination end 74 of the connector 14, although alternatives are possible. The stem portion 72 of the connector 14 also includes an inner surface 78 and an opposing outer surface 80. The inner surface 78 of the connector 14 includes a taper 79.The taper 79 is for forming an inner tube and for inserting the optical fiber cable 36 without damaging it. The spigot 76 can be positioned on the outer surface 80 of the connector 14. The spigot preferably extends circumferentially around the outer surface 80. The spigot 76 has a shoulder 116, an outward-facing surface 118, and a rearward-facing tip 120. Portion 122 of the spigot 76 is also part of the taper 79. The connector 14 also includes a taper 77 in a fiber entry area of ​​the ferrule 12. Still referring to Figure 8, the optical fiber connector 10 further includes an overmolded inlet tube 82 (e.g., an epoxy tube) in accordance with the principles of this description. The overmolded inlet tube 82 defines a passage 84 with a tube axis 86 that aligns with the central axis 26. That is, the tube axis 86 and the central axis 26 can be aligned concentrically or coaxially. The overmolded inlet tube 82 can be arranged and configured to pass through a central region of the spring 52. The overmolded inlet tube 82 can extend rearward into the cable strain relief sleeve 58 to facilitate or guide the insertion of the epoxy needle for filling the connector and / or to facilitate or guide the optical fiber 38 into the optical fiber ferrule 12. The overmolded inlet tube 82 is molded onto the second end 70 of the connector 14. The overmolded inlet tube 82 can be manufactured from a cast material that is molded onto the second end of the connector 14 so that the overmolded inlet tube 82 and the connector 14 can be mechanically joined. That is, the overmolded inlet tube 82 is connected to the connector 14 by a non-unitary connection. The phrase “non-unitary connection” is intended to mean that the overmolded inlet tube 82 and the connector 14 are not formed as a single, seamless, unitary piece. The overmolded inlet tube 82 can be made from a flexible, injection-moldable plastic material. In certain examples, the overmolded inlet tube 82 is made from a thermoplastic material. The inlet tube 82 is more flexible than the connector 14. This construction can improve the connector 10's ability to meet side-load requirements without excessive attenuation or fiber damage, as could occur if the connector and ferrule were molded simultaneously from the same material. In fiber connectors, it is desirable for the connector to grip the ferrule tightly, and a more rigid material serves this purpose. An overmolded inlet tube is advantageous over a more flexible tube that is pushed onto the connector end. The pushed-on, more flexible tube can create an internal fiber capture point. The pushed-on, more flexible tube may not be as easy to use in automated manufacturing where the tube must be added and then an axial profile maintained to allow the epoxy needle and / or fiber tip to enter and pass through. A pushed-in inner tube will take up space and may not allow the needle and cable to pass through unless the connector body is enlarged. This may not be possible due to industry sizing conventions. The more flexible, pushed-in inner tube may not be as easy to use in automated manufacturing where the tube must be added, and then an axial profile maintained to allow the epoxy needle and / or fiber tip to enter and pass through. Once the overmolded inlet tube has been manufactured, the ferrule, connector, and tube can be handled as a single unit during connection via the fiber optic cable connector. Connector 14 includes an axial passage 106 that defines the upper hole section 88, located between a first end of hole 90 and a second end of hole 92, through which the buffer cable 42 is passed. The upper hole section 88 can be adapted to accommodate the end of the buffer layer 42. Therefore, the upper hole section 88 can be arranged and configured with a diameter larger than the 900-micron buffer layer 42, such as 970 microns. In one example, the distance between the first and second ends of hole 90, 92 is approximately 1.5–2.0 mm, such as 1.7 mm. The overmolded inlet tube 82 has a distal end 98 that tapers outward along an inner surface to facilitate the insertion of the fiber 38 and buffer layer 42 of the optical fiber cable 36 into the passage 84. Connector 14 also defines a third end of the orifice 94 at the front of the inlet tube end, configured to provide a desired location just downstream of it for positioning an epoxy depositing needle. An epoxy needle sealing zone 96 can be defined between the second end of orifice 92 and the third end of orifice 94. A taper 79 exists between the second end of orifice 92 and the third end of orifice 94, extending to the end of connector 74. The epoxy needle can be sealed against the taper 79 so that a controlled volume of epoxy can be dispensed. As illustrated in Figures 8 and 8A, the inner surface 78 of the stem portion 72 of the connector 14 begins to taper outwards from the second end of the hole 92 relative to the central axis 26 to form the taper 79. A portion of the taper 79 is covered by the tube 82. In one example, the internal surface 78 of connector 14 has a tapered length L corresponding to the covered portion, which can be defined from the third end of hole 94 to the termination end 74 of connector 14. The taper 79 is approximately 3 mm long in the axial direction from end 92 to end 74. End 92 is located in an example of a hole size of 0.97 mm. The tapered length L can be approximately 2.0–2.1 mm long in the axial direction from the third end of hole 94, at an illustrative hole size of 1.13 mm (0.57 mm radially relative to the center axis 26), to the termination end 74, at an illustrative hole size of 1.5 mm (0.75 mm radially) relative to the center axis 26.The internal surface 78 along the taper 79 of the stem portion 72 of the connector 14 can form a cone shape with an angle α of approximately 11 degrees + / - 1 degree centered around the central axis 26. The overmolded inlet tube 82 can be constructed of plastic by an injection molding process in which a resin or polymeric material can be used to form a mold. The method may include a step of inserting a solid overmolded pin into the connector 14 along the centerline 26 until the solid overmolded pin bottoms out. The solid overmolded pin can be positioned within the stem portion 72 of the connector 14. It will be appreciated that the location of the solid overmolded pin can be stopped within a range inside the connector 14 between the second end of the bore 92 and the termination end 74, although alternatives are possible. In certain examples, the solid overmolded pin can be positioned slightly beyond or slightly near the third end of the recessed bore 94 in the tapered length area L of the stem portion 72.It is desired that the needle closure zone 96 be positioned downwards from the overmolded pin stop 94 towards a front end of the connector. It is preferred that the needle closure be positioned against the connector 14, along the taper 79, downwards from the inner portion of the tube 82. £ I bb7n / 77n7 / =l / Yl· In certain examples, the overmolding can be configured with a stage 100 defined between a first outside diameter DE1 and a second outside diameter DE2 of the overmolded inlet tube 82. During the molding process, the polymer resin flows around to fill the areas in and around the stem portion 72 of the connector 14 to form the overmolded inlet tube 82. When the overmolded inlet tube 82 is sufficiently rigid (e.g., before it is fully cured or cooled), the solid overmolded pin can be removed from it. The overmolded tube 82 in the example has a slight taper between the third end of the hole 94 and the distal end 98 to release the solid overmolded pin. Therefore, the overmolded inlet tube 82 can be formed as a result of molding around the solid overmolded pin positioned in the connector 14.Tube 82 may have a greater taper on the inner surface immediately adjacent to end 98, if desired. The overmolded inlet tube 82 can surround all sides of the stem portion 72 of connector 14, thus preventing potential pinch points when the optical fiber 38 is inserted. Specifically, the overmolded inlet tube 82 can cover the inner surface 78 of the stem portion 72 of connector 14, including the tapered length L. The overmolded inlet tube 82 tapers inside connector 14 from the termination end 74 of connector 14 to approximately zero thickness at the third end of the hole 94. As such, the inside of connector 14 is surrounded by the overmolded inlet tube 82 to eliminate optical fiber capture points. The overmolded inlet tube 82 can have a taper that continues along the tapered length L.Therefore, similar to the angle α of the tapered length L, the angle α of the overmolded inlet tube 82 molded onto the inner surface 78 of the stem portion 72 within the connector 14 can be tapered from the termination end 74 to the third end of the hole 94 and will be 5.5 degrees + / - 0.5 degrees with respect to a center axis 26 to approximately zero thickness with respect to the center axis 26. Therefore, the overmolded inlet tube 82 has a taper that prevents snagging points at the connector tip that could interfere with and stop the advance of the optical fiber 38. The inside diameter of the tube 82 also has a small internal taper to facilitate its manufacturing. The overmolded inlet tube 82 is shown molded to completely surround the outer surface 80 of the connector and the stud 76 positioned over it. That is, the overmolded inlet tube 82 completely encapsulates the stud 76 of the connector 14. As such, the overmolded inlet tube 82 can be molded over four side portions of the connector 14. The stud 76 of the connector 14 can be configured to function as a retaining element that engages the overmolded inlet tube 82 to help secure the overmolded inlet tube 82 within the fiber optic connector 10. £ I bb7n / 77n7 / =l / Yl· In certain examples, the retention feature may include a projection, recess, shoulder, or dent that can be arranged and configured to help prevent the overmolded inlet tube 82 from coming loose. The end 48 of the damper 42 can be extended deeper into the connector 14 than illustrated in the example in Figures 10 and 10A, if desired. See arrow 49. Figures 11-28 illustrate another example of a 200 fiber optic connector with characteristics in accordance with the principles of this description. The illustrated 200 fiber optic connector is configured as an LC connector and is designed for use in fiber optic equipment that has a standard LC footprint. The fiber optic connector 200 includes a front housing 202 that defines a body 204 with opposing side walls 206, 208, a top wall 210, a bottom wall 212, a front end 214, and a rear end 216. In certain examples, the front housing 202 may be formed from a molded material, including various polymers. The front housing 202 defines a grip 218 that extends from a top wall 210 of the front housing 202 to the rear end 216. The grip 218 extends at an acute angle to the top wall 210 of the front housing 202. The front housing 202 also includes a grip trigger 220 that extends from the rear end 216 of the front housing 202 to the front end 214. The grip trigger 220 also extends at an acute angle to the top wall 210.The grip trigger 220 is configured to make contact with the latch 218 to flexibly move the grip 218 downwards. When the 200 fiber optic connector is placed in an adapter to optically couple the light from two optical fibers together, the grip 218 functions to lock the 200 fiber optic connector in place within the fiber optic adapter. The 200 fiber optic connector can be removed from the fiber optic adapter by pressing the grip trigger 220, which causes the grip 218 to be pressed downward, releasing the grip 218 from the fiber optic adapter. The front housing 202 defines a front opening 222, a rear opening 224, and an internal cavity 226 that extends between these. The front opening 222 and the rear opening 224 are circular in shape. The fiber optic connector 200 includes a rear insert 228 adapted to mate with the front housing 202 to form the fiber optic connector 200. The rear insert 228 mates with the front housing 202 to capture a spring 230 and a ferrule connector 232 within it. When the fiber optic connector 200 is assembled, a terminal end of an optical fiber 234 (see Figure 19) extends through the front opening 222. The optical fiber 234 is an extension of an optical fiber carried in an optical fiber cable. 236 (see Figure 19) terminated in the 200 fiber optic connector. The same general fiber sizes are used in SC and LC. One difference is that the LC connector has a smaller footprint than the SC connector in the axial direction. An LC ferrule is typically half the outside diameter of an SC ferrule. Within the optical fiber connector 200, the optical fiber 234 can pass through an engagement sleeve 238 and the back insert 228 before being routed into the internal cavity 226 of the front housing 202. The back insert 228 includes a rear portion 240 that defines an engagement zone for engaging with the Kevlar-reinforced layer of the cable, as commonly known in the art. A strain relief sleeve 242 surrounds the back portion 240 and the optical fiber cable 236. The strain relief sleeve 242 can be in a press-fit connection with the rear portion 240 of the back insert 228. A ferrule 244 of the optical fiber connector 200 includes a body 246 with a first end 248 defining a ferrule tip. The first end 248 may comprise a polished end-face surface that abuts an end face of another ferrule when the optical fiber connector 200 is disposed in an adapter that optically couples the optical fiber disposed within the adapter. The first end 248 of the ferrule 244 is typically polished together with the optical fiber 234 after the optical fiber 234 is installed. The body 246 of the ferrule 244 is typically of ceramic construction. The ferrule 244 includes a center shaft 250. Once the ferrule connector 232, ferrule 244, and spring 230 have been placed in the front housing 202, the rear insert 228 can be positioned in contact with one end of the spring 230. The rear insert 228 holds the ferrule connector 232 and spring 230 in place within the front housing 202 while also improving the side load-bearing capacity of the fiber optic connector 200. Turning to Figures 16-18, the splint connector 232 and splint 244 are illustrated. Splint 244 can be attached to splint connector 232 using a variety of methods. Generally, splint 244 and splint connector 232 are secured together using convenient methods, including adhesive or snap-fit ​​mounting. In certain examples, including the illustrated example, the ferrule connector 232 is a plastic material that is overmolded onto the ferrule 244. As described above, with respect to the optical fiber ferrule 12 and connector 14, the ferrule 244 and ferrule connector 232 are connected to one end of the optical fiber cable 236 for use in the optical fiber cable end connector 236. As illustrated in Figure 20, the body 246 of the ferrule 244 includes an opposite end 252 received in a cavity 254 of the ferrule connector 232. In certain preferred embodiments, the body 246 of the splint 244 is made of thiol-stabilized zirconium oxide, thiol-stabilized zirconium, YSZ, Y2O3-stabilized ZrO2, etc. In certain preferred embodiments, the body 246 of the splint 244 is molded. By molding the splint 244, internal features can be incorporated. These internal features can be smooth and continuous and include curvature. Continuous and uniform internal features can be produced at a lower cost than with alternative methods, such as machining. Furthermore, the fiber is better protected against scratches. Returning to Figures 18-21, the splint 244 includes a central passage 256 concentric with the central axis 250. The central passage 256 extends from the first end 248 to the opposite end 252. The central passage 256 includes a first portion 258 having a first diameter DA, an intermediate or second portion 260 having a second diameter DB, and a rear or third portion 262 dimensioned to a third diameter DC. As mentioned earlier, a small taper in the connector leads to the third portion 262. As with the first portion 30 mentioned above, the first portion 258 is sized to receive an inner fiber sized to 125 microns. As with the second portion 32 mentioned above, the second portion 260 is sized to receive the portion of the optical fiber cable 236 that includes an outer coating to 250 microns. That is, the ferrule 244 includes dual-diameter portions 258 and 260, each specially sized to receive an inner fiber (125 microns) and a portion of an outer coating (250 microns), respectively. As with the third portion 34 mentioned above, the third portion 262 tapers inward from the opposite end 252 to facilitate the insertion of the optical fiber 234 during installation. Having a smooth, continuous center passage 256 substantially reduces scratches and scrapes on the inner fiber 38 and outer coating 40. Scratches and scrapes on the inner fiber 38 and / or outer coating 40 can produce defects that may develop into fatigue cracks and cause failure of the optical fiber 234. The ferrule 244 closely surrounds the optical fiber 234 and the coating 40. The ferrule connector 232 includes an axial passage 264 that defines a section of the upper hole 266 between a first end of hole 268 and a second end of hole 270 through which the buffer layer 42 of the optical fiber cable 236 passes. The upper hole section 266 can be adapted to accommodate the end of the buffer layer 42. Therefore, the upper hole section 266 can be arranged and configured with a diameter larger than the 900-micron buffer layer 42. In one example, the distance between the first and second ends of hole 268, 270 is approximately 0.6 mm, with an outward taper of approximately 10 degrees relative to the axis. The ferrule connector 232 also defines a third end of hole 272 that tapers outward. The distance between the ends of holes 270 and 272 is approximately 2.5 mm in one example, each with a hole diameter of 0.97 mm. The buffer layer 42 is shown closer to the ferrule 244 in connector 200 than in connector 10. These figures illustrate the variability and range of possible locations of the fiber and buffer tube in the described connectors. The ferrule connector 232 includes a first end 276 and a second end 278 such that the first end 276 of the ferrule connector 232 is configured to mount onto the opposite end 252 of the ferrule 244. The second end 278 of the ferrule connector 232 may include a stem portion 280 extending in a direction toward the rear insert 228 and terminating at a termination end 282. In certain examples, the stem portion 280 may include a slanted flange or spigot portion 284 extending radially outward adjacent to the termination end 282 of the ferrule connector 232, although alternatives are possible. The stem portion 280 of the ferrule connector 232 may also include an inner surface 286 and an opposing outer surface 288.The inner surface 286 of the ferrule connector 232 tapers outward from the third end of the hole 272 to facilitate insertion of the optical fiber cable 236 without damaging the optical fiber cable 236. The stud 284 can be placed on the outer surface 288 of the ferrule connector 232. There is a tapered portion 290 that begins to taper outward from the third end of the hole 272 relative to the center axis 250 toward the second end 278 of the ferrule connector 232. An epoxy needle can be sealed against the taper so that a controlled volume of epoxy can be dispensed. The epoxy is used within the central passage 256 to adhesively bond the fiber optic cable 236 to the ferrule 244. An epoxy needle sealing zone 292 can be defined adjacent to the third end of the hole 272. That is, an epoxy needle can be sealed against the tapered portion 290 of the ferrule connector 232 so that a controlled volume of epoxy can be dispensed. With reference to Figures 22-28, the optical fiber connector 200 further includes an overmolded inlet tube 294 (e.g., an epoxy tube) in accordance with the principles of this description. The overmolded inlet tube 294 defines a passage 274 with a tube axis 296 that aligns with the center axis 250. That is, the tube axis 296 and the center axis 250 can be aligned concentrically or coaxially. The overmolded inlet tube 294 can be arranged and configured to pass through a central region of the spring 230. The overmolded inlet tube 294 can be extended rearward into the cable strain relief sleeve 242 to facilitate or guide the insertion of the optical fiber 234 into the ferrule 244. The overmolded inlet tube 294 is molded onto the second end 278 of the splint connector 232. The overmolded inlet tube 294 can be made of a flexible, injection-moldable plastic material. In certain examples, the overmolded inlet tube 294 is made from a thermoplastic. In certain examples, the overmolded inlet tube 294 can be made of a molten material that is molded onto the second end of the splint connector 232 so that the overmolded inlet tube 294 and the splint connector 232 can be mechanically joined. That is, the overmolded inlet tube 294 is connected to the splint connector 232 by a non-unit connection. The phrase “non-unitary connection” is intended to mean that the overmolded inlet tube 294 and the splint connector 232 are not formed as a single, seamless, unitary piece. The overmolded inlet tube 294 can be constructed from plastic by an injection molding process as described above with reference to the overmolded inlet tube 82. During the molding process, polymer resin flows around a solid overmolded pin to fill the areas within and around the stem portion 280 of the ferrule connector 232 to form the overmolded inlet tube 294. The tube 294 terminates in the hole 295 along the tapered portion 290 of the ferrule connector 232. In one example, the diameter of the hole 295 is approximately 1.15 mm. Referring back to Figure 21, the overmolded inlet tube 294 can surround all sides of the stem portion 280 of the ferrule connector 232, thus avoiding all potential entrapment points when inserting the optical fiber 234. That is, the overmolded inlet tube 294 can be molded to surround all sides of the stem portion 280 of the ferrule connector 232 so that the spigot 284 of the ferrule connector 232 can be completely encapsulated by the overmolded inlet tube 294. As such, the overmolded inlet tube 294 can be molded over four lateral portions of the ferrule connector 232. The overmolded inlet tube 294 can cover portions of the inner surface 286 and the outer surface 288 of the ferrule connector 232.The overmolded inlet tube 294 can partially surround the inner surface 286 of the tapered portion 290 to taper into the splint connector 14 from the termination end 282 of the splint connector 232 to approximately zero in thickness. In one example, the distance along the axis from the third end of hole 272 to the termination end 282 is approximately 0.65 mm, and the distance between the third end of hole 272 and hole 295 (inner end of the epoxy tube) is approximately 0.35 mm. The termination end 282 defines an inner hole diameter of approximately 1.30 mm in the illustrated example. The tapered portion 290 of the ferrule connector 232 has an angle α1. The angle α1 can be approximately 30 degrees, although alternatives are possible. The overmolded inlet tube 294 can be formed over the tapered portion 290 and meet at a point 298 where the overmolded inlet tube 294 tapers to zero thickness. The inside of the ferrule connector 232 is surrounded by the overmolded inlet tube 294 to eliminate optical fiber capture points. The angle α2 of the overmolded inlet tube 294 within the ferrule connector 232 can be tapered from the termination end 282 to point 298 and can be approximately 15 degrees ± 1 degree with respect to the centerline 250. The ferrule connector 232's stud 284 can be configured to function as a retaining feature that engages the overmolded inlet tube 294 to help secure the overmolded inlet tube 294 within the fiber optic connector 200, similar to stud 76. In certain examples, the retaining feature may include a protrusion, recess, shoulder, or dent that can be arranged and configured to help prevent the overmolded inlet tube 294 from dislodging. The overmolded inlet tube 294 has an internal taper 300 from a proximal end 302 that tapers outward toward a distal end 304 to facilitate the insertion of the fiber optic cable 236's buffer layer 42 into the passage 274. As mentioned above, the epoxy needle closure zone 292 along the tapered portion 290 is down from point 298 where the overmolded inlet tube 294 tapers to zero thickness. Returning to Figure 26, the splint 144 defines a cutout 306 (e.g., recess, cavity) adapted to receive a projection 308 (e.g., protrusion) from the splint connector 232. Together, the cutout 306 and projection 308 can be arranged and configured to provide a retention feature so that the splint 244 and splint connector 232 can be mechanically secured together. In certain configurations, optical fiber 38 may include a bare glass portion 310 extending through the optical fiber ferrule 12, the ferrule connector 232, and a coated portion 312 extending through the remaining optical fiber connectors 10, 200. In one example, the bare glass portion 310 may have a diameter in the range of 120–140 microns, and the coated portion 312 may have a diameter greater than 230 microns. In certain examples, the bare glass portion 310 includes a core 314 (see Figure 29) surrounded by a cladding layer 316, and the coated portion 312 includes the core 314, the cladding layer 316, and one or more cladding layers 318 (see Figure 30). The 312 coated portion may also include a loose or airtight 320 buffer tube surrounding the 318 coating layer to provide additional protection.The 320 buffer tube may have an outer diameter of, for example, approximately 900 microns, applied over the 318 coating layer and further protecting the fiber. This is also known as "additional coating." Although a single 38 optical fiber is illustrated, it will be appreciated that more than one 38 optical fiber can be placed inside the 320 buffer tube, such as two, four, eight, or even up to 24 optical fibers. The 38 optical fiber can be loosely placed inside the 320 buffer tube to provide a "loose tube arrangement" or it can be positioned to provide a "tight tube arrangement." An inner core of an optical fiber cable may include a plurality of strength members. In one example, the plurality of strength members are fibers or yarns that completely surround the 320 buffer tube. The yarns may be made of aramid fibers, such as those sold under the Kevlar trademark. In certain examples, the optical fiber cable includes at least one rigid strength member within the inner core. In one aspect, the various fiber optic connectors include a ferrule assembly comprising a ferrule and a connector. The ferrule has a first end and an opposite second end. The ferrule defines a fiber passage extending between the first and second ends of the ferrule. The fiber passage is concentric with a central axis of the ferrule, with the connector mounted around the second end of the ferrule. The connector includes an axial passage. The connector has a tapered inner surface portion and an outer surface portion, and the connector extends along the central axis. An overmolded inlet tube is molded onto the outer surface portion of the connector such that the overmolded inlet tube covers the end of the connector, and the overmolded inlet tube is also molded onto a portion of the tapered inner surface portion of the connector. In an additional aspect, the tapered inner surface of the connector is used to: form the inner end portion of the overmolded tube through the molding pin; and seal against the epoxy needle. In another aspect, the overmolded inlet tube is molded over the end of the outer surface portion of the connector so that the overmolded inlet tube covers the outer end of the connector and the overmolded inlet tube is also molded over a portion of the tapered inner surface portion of the connector. In an additional aspect, a portion of the connector end is encapsulated by the overmolded tube on four sides: 1) an inward-facing portion, 2) an outward-facing portion, 3) a portion facing the distal end of the connector; and 4) an additional portion facing the front or proximal end of the connector. In another aspect, the various fiber optic connectors include a ferrule assembly comprising a ferrule and a connector. The ferrule has a first end and an opposite second end. The ferrule defines a fiber passage extending between the first and second ends of the ferrule. The fiber passage is concentric with a central axis of the ferrule. The connector is mounted around the second end of the ferrule. The connector includes an axial passage. The connector has a tapered inner surface portion and an outer surface portion. The connector includes a retaining member that extends circumferentially around the connector around the outer surface, and the connector extends along the central axis.An overmolded inlet tube has a tubular shape and is molded over the outer surface portion of the connector such that the overmolded inlet tube completely encapsulates the retaining member of the connector, and the overmolded inlet tube is also molded over the tapered inner surface portion of the connector, wherein the overmolded inlet tube intersects the tapered inner surface portion of the connector and tapers to zero thickness along the tapered inner surface portion of the connector. In another aspect, the various fiber optic connectors include a ferrule assembly comprising a ferrule and a connector. The ferrule has a first end and an opposite second end. The ferrule defines a fiber passage that extends between the first and second ends of the ferrule. The fiber passage is concentric with a central axis of the ferrule, with the connector mounted around the second end of the ferrule. The connector includes an axial passage. The connector has a tapered inner surface portion and an outer surface portion, and the connector extends along the central axis.An overmolded inlet tube is molded over the outer surface portion of the connector such that the overmolded inlet tube completely encapsulates the end portion of the connector and the overmolded inlet tube is also molded over the tapered inner surface portion of the connector, wherein the overmolded inlet tube tapers to a zero point along the tapered inner surface portion of the connector and defines a needle-lock zone on the descending tapered inner surface of the location where the inlet tube tapers to zero. In another aspect, the various fiber optic connectors include a ferrule assembly comprising a ferrule and a connector. The ferrule has a first end and an opposite second end. The ferrule defines a fiber passage extending between the first and second ends of the ferrule. The fiber passage is concentric with a central axis of the ferrule, with the connector mounted around the second end of the ferrule. The connector includes an axial passage. The connector has a tapered inner surface portion and an outer surface portion, and the connector extends along the central axis. An overmolded inlet tube is molded onto the outer surface portion of the connector, giving the overmolded inlet tube a generally cylindrical external shape. A slight taper may be applied for manufacturing purposes.The overmolded inlet tube is also molded onto the inner surface portion of the connector, giving it a generally cylindrical interior shape. A slight taper may be applied to the inside during manufacturing. The overmolded inlet tube covers a distal end of the connector. Optionally, a retaining member may be defined on the outer surface portion of the connector, where the tube completely encapsulates the retaining member. Tapered inlets can be applied to the distal ends of the tubes to facilitate needle and / or fiber insertion. Generally, the tubing extends adjacent to the distal ends of the rear portion of the connector body. The tubing may be short, nearly equal to, or extend beyond the distal end of the connector body. The various examples described above are provided for illustrative purposes only and should not be interpreted as limiting the scope of this description. Those skilled in the art will readily recognize several modifications and changes that can be made without following the examples and applications illustrated and described herein, and without departing from the true spirit and scope of this description. NOVELTY OF THE INVENTION Having described the present invention as above, the following is considered novel and, therefore, is claimed as property:

Claims

1. An optical fiber connector comprising: a ferrule assembly including a ferrule and a connector, the ferrule having a first end and an opposite second end, the ferrule defining a fiber passage extending between the first and second ends of the ferrule, the fiber passage being concentric with a central axis of the ferrule; the connector mounted around the second end of the ferrule, the connector including an axial passage, the connector having a tapered inner surface portion and an outer surface portion and the connector extending along the central axis; a retaining member defined on the outer surface portion of the connector at a rear end thereof;and an overmolded inlet tube that is molded over the outer surface portion of the connector such that the overmolded inlet tube completely encapsulates the retaining member of the connector and the overmolded inlet tube is also molded over the tapered inner surface portion of the connector.; 2. The optical fiber connector of claim 1, wherein the overmolded inlet tube tapers to zero along the tapered inner surface portion of the connector.

3. The fiber optic connector of claims 1-2, wherein the ferrule is a ceramic ferrule.

4. The optical fiber connector of claims 1-3, wherein the overmolded inlet tube is constructed of a flexible plastic material that is more flexible than the connector.

5. The fiber optic connector of claims 1-4, wherein the fiber optic connector is an SC type fiber optic connector.

6. The fiber optic connector of claims 1-4, wherein the fiber optic connector is an LC type fiber optic connector.

7. The optical fiber connector of claims 1-6, wherein the overmolded inlet tube tapers to zero along the tapered inner surface portion of the connector and defines a needle-lock zone on the downward tapered inner surface of the location where the inlet tube tapers to zero.

8. The optical fiber connector of claims 1-7, wherein the retaining member defines a circumferentially extending pin.

9. The optical fiber connector of claims 1-8, wherein the overmolded inlet tube is zero-tapered along the tapered inner surface portion of the connector, and the tapered inner surface of the connector defines a mold pin closure zone forming the zero-taper, and a needle closure zone on the downward-tapered inner surface of the location where the inlet tube is zero-tapered.

10. An optical fiber connector comprising: a ferrule assembly including a ferrule and a connector, the ferrule having a first end and an opposite second end, the ferrule defining a fiber passage extending between the first and second ends of the ferrule, the fiber passage being concentric with a central axis of the ferrule; the connector mounted around the second end of the ferrule, the connector including an axial passage, the connector having a tapered inner surface portion and an outer surface portion, the connector including a retaining member extending circumferentially around the connector around the outer surface and the connector extending along the central axis;and an overmolded inlet tube molded onto the outer surface portion of the connector such that the overmolded inlet tube completely encapsulates the retaining member of the connector and the overmolded inlet tube also molded onto the tapered inner surface portion of the connector, wherein the overmolded inlet tube tapers to zero along the tapered inner surface portion of the connector.

11. The fiber optic connector of claim 10, wherein the ferrule is a ceramic ferrule.

12. The optical fiber connector of claims 10-11, wherein the overmolded inlet tube is constructed of a flexible plastic material that is more flexible than the connector.

13. The fiber optic connector of claims 10-12, wherein the fiber optic connector is an SC type fiber optic connector.

14. The fiber optic connector of claims 10-12, wherein the fiber optic connector is an LC type fiber optic connector.

15. The optical fiber connector of claims 10-14, wherein the overmolded inlet tube tapers to zero along the tapered inner surface portion of the connector and defines a needle-lock zone on the downward tapered inner surface of the location where the inlet tube tapers to zero.

16. The optical fiber connector of claims 10-15, wherein the retaining member defines a circumferentially extending pin.

17. The optical fiber connector of claims 10-16, wherein the tapered inner surface of the connector defines a mold pin closing zone forming the zero taper and a needle closing zone on the downward tapered inner surface of the location where the inlet tube tapers to zero.

18. An optical fiber connector comprising: a ferrule assembly including a ferrule and a connector, the ferrule having a distal end and a proximal end, the proximal end of the ferrule being mounted on a front end of the connector, the ferrule defining a fiber passage that is concentric with a central axis of the ferrule, the fiber passage extending through the ferrule from the proximal end to the distal end, the connector having a tapered inner surface portion and an outer surface; and an overmolded inlet tube extending along the central axis, the overmolded inlet tube being adapted to completely encapsulate a rear end of the connector, the overmolded inlet tube having a taper along the tapered inner surface portion of the connector, wherein the overmolded inlet tube tapers to zero along the tapered inner surface portion of the connector.

19. The optical fiber connector of claim 18, wherein the ferrule is a ceramic ferrule.

20. The optical fiber connector of claims 18-19, wherein the overmolded inlet tube is constructed of a flexible plastic material that is more flexible than the connector.

21. The fiber optic connector of claims 18-20, wherein the fiber optic connector is an SC type fiber optic connector.

22. The fiber optic connector of claims 18-20, wherein the fiber optic connector is an LC type fiber optic connector.

23. The optical fiber connector of claims 18-22, wherein the overmolded inlet tube tapers to zero along the tapered inner surface portion of the connector and defines a needle-lock zone on the downward tapered inner surface of the location where the inlet tube tapers to zero.

24. The optical fiber connector of claims 18-23, wherein the overmolded inlet tube is zero-tapered along the tapered inner surface portion of the connector, and the tapered inner surface of the connector defines a mold pin closure zone forming the zero-taper and a pin closure zone on the descending tapered inner surface of the location where the inlet tube is zero-tapered.

25. An optical fiber connector comprising: a front housing defining a top wall, a bottom wall, a first side wall, a second side wall, a front opening at a front end, a circular rear opening at a rear end, and an internal cavity extending between them along a central axis, each of the first and second side walls defining a groove extending from the internal cavity to an exterior of the front housing; an optical fiber ferrule connector carrying a terminal end of an optical fiber, at least a portion of the optical fiber ferrule connector extending through the front opening, the optical fiber ferrule connector having a rear-end retaining member; a rear insert, the rear insert including a generally cylindrical front portion configured to be inserted into the front housing through the rear opening;a spring positioned between the fiber optic ferrule connector and the rear insert that deflects the fiber optic ferrule connector in a forward direction relative to the rear insert; and an inlet tube overmolded over the fiber optic ferrule connector to completely encapsulate the rear-end retaining member of the fiber optic ferrule connector.

26. The optical fiber connector of claim 25, wherein the overmolded inlet tube tapers to zero along a tapered inner surface portion of the optical fiber ferrule connector.

27. The fiber optic connector of claims 25-26, wherein the fiber optic ferrule connector is a ceramic fiber optic ferrule connector.

28. The optical fiber connector of claims 25-27, wherein the overmolded inlet tube is constructed of a flexible plastic material that is more flexible than the optical fiber ferrule connector.

29. The fiber optic connector of claims 25-28, wherein the fiber optic connector is an SC type fiber optic connector.

30. The fiber optic connector of claims 25-28, wherein the fiber optic connector is an LC type fiber optic connector.

31. The optical fiber connector of claims 25-30, wherein the overmolded inlet tube tapers to zero along the tapered inner surface portion of the optical fiber ferrule connector and defines a needle-lock zone on the downward tapered inner surface of the location where the inlet tube tapers to zero.

32. The optical fiber connector of claims 25-31, wherein the rear-end retaining member defines a circumferentially extending pin.

33. The optical fiber connector of claims 25-32, wherein the overmolded inlet tube tapers to zero along the tapered inner surface portion of the optical fiber ferrule connector and the tapered inner surface of the optical fiber ferrule connector defines a mold pin closure zone forming the taper to zero and a pin closure zone on the descending tapered inner surface of the location where the inlet tube tapers to zero.

34. An optical fiber connector comprising: a ferrule assembly including a ferrule and a connector, the ferrule having a first end and an opposite second end, the ferrule defining a fiber passage extending between the first and second ends of the ferrule, the fiber passage being concentric with a central axis of the ferrule; the connector mounted around the second end of the ferrule, the connector including an axial passage, the connector having a tapered inner surface portion and an outer surface portion, and the connector extending along the central axis;and an overmolded inlet tube molded onto the outer surface portion of the connector such that the overmolded inlet tube completely encapsulates the end of the connector, and the overmolded inlet tube also molded onto the tapered inner surface portion of the connector, wherein the overmolded inlet tube tapers to zero along the tapered inner surface portion of the connector and defines the needle closure zone on the descending tapered inner surface of the location where the inlet tube tapers to zero.

35. The optical fiber connector of claim 34, wherein the overmolded inlet tube is constructed of a flexible plastic material that is more flexible than the connector.

36. The fiber optic connector of claims 34-35, wherein the fiber optic connector is an SC type fiber optic connector.

37. The fiber optic connector of claims 34-35, wherein the fiber optic connector is an LC type fiber optic connector.

38. The optical fiber connector of claims 34-37, wherein the tapered inner surface of the connector defines a molded pin locking zone that forms the taper to zero.

39. An optical fiber connector comprising: a ferrule assembly including a ferrule and a connector, the ferrule having a distal end and a proximal end, the proximal end of the ferrule being mounted on a front end of the connector, the ferrule defining a fiber passage that is concentric with a central axis of the ferrule, the fiber passage extending through the ferrule from the proximal end to the distal end, the connector having a tapered inner surface portion and an outer surface; and an overmolded inlet tube extending along the central axis, the overmolded inlet tube being adapted to completely encapsulate a rear end of the connector, the overmolded inlet tube having a taper along the tapered inner surface portion of the connector relative to the central axis, wherein the overmolded inlet tube tapers to zero along the tapered inner surface portion of the connector.

40. The optical fiber connector of claim 39, wherein the overmolded inlet tube is constructed of a flexible plastic material that is more flexible than the connector.

41. The optical fiber connector of claims 39-40, wherein the overmolded inlet tube defines a needle-closing zone on the downward-tapered inner surface of the location where the inlet tube tapers to zero.

42. The optical fiber connector of claims 39-40, wherein the tapered inner surface of the connector defines a mold pin closing zone forming the zero taper and a needle closing zone on the downward tapered inner surface of the location where the inlet tube tapers to zero.

43. An optical fiber connector comprising: a front housing defining a top wall, a bottom wall, a first side wall, a second side wall, a front opening at a front end, a circular rear opening at a rear end, and an internal cavity extending between them along a central axis, each of the first and second side walls defining a groove extending from the internal cavity to an exterior of the front housing; an optical fiber ferrule connector carrying a terminal end of an optical fiber, at least a portion of the optical fiber ferrule connector extending through the front opening, the optical fiber ferrule connector having a rear-end retaining member; a rear insert, the rear insert including a generally cylindrical front portion configured to be inserted into the front housing through the rear opening;a spring placed between the fiber optic ferrule connector and the back insert and which deflects the fiber optic ferrule connector in a forward direction relative to the back insert; and an overmolded inlet tube molded over the fiber optic ferrule connector to completely encapsulate the rear-end retaining member of the fiber optic ferrule connector, the overmolded inlet tube having a taper along a portion of the fiber optic ferrule connector, the taper being at an angle with respect to the central axis, wherein the overmolded inlet tube tapers to zero along a tapered inner surface portion of the fiber optic ferrule connector and defines a needle-lock zone on the descending tapered inner surface at the location where the inlet tube tapers to zero. £ I bb7n / 77n7 / =l / Yl·; 44. The optical fiber connector of claim 43, wherein the overmolded inlet tube is constructed of a flexible plastic material that is more flexible than the optical fiber ferrule connector.

45. The optical fiber connector of claims 43-44, wherein the rear-end retaining member defines a circumferentially extending pin.

46. ​​The optical fiber connector of claims 43-45, wherein the tapered inner surface of the optical fiber ferrule connector defines a molded pin closure zone that forms the taper to zero.

47. An optical fiber connector comprising: a ferrule assembly including a ferrule and a connector, the ferrule having a first end and an opposite second end, the ferrule defining a fiber passage extending between the first and second ends of the ferrule, the fiber passage being concentric with a central axis of the ferrule, the fiber passage of the ferrule including: a first portion adjacent to the first end of the ferrule and exposed to opening at the first end of the ferrule, the first portion defining a first internal passage having a first cross-sectional area constant along an entire length of the first internal passage;a second portion positioned adjacent to the first internal passage of the first portion and between the first portion and the second end of the splint, the second portion defining a second internal passage adjacent to the first internal passage of the first portion and having a second constant cross-sectional area along an entire length of the second internal passage; and a transition area extending between a first end and an opposite second end, the first end adjoining the second portion and the second end adjoining the second end of the splint, the transition area having an internal diameter that changes continuously between the first end and the second end, wherein the transition area has a diameter that increases in one direction from the first portion to the second portion of the fiber passage of the splint;the connector mounted around the second end of the splint, the connector includes an axial passage, the connector has a tapered inner surface portion and an outer surface portion and the connector extends along the central axis; a retaining member defined on the outer surface portion of the connector at a rear end thereof; and an overmolded inlet tube molded over the outer surface portion of the connector such that the overmolded inlet tube completely encapsulates the retaining member of the connector and the overmolded inlet tube is also molded over the tapered inner surface portion of the connector.

48. The optical fiber connector of claim 47, wherein the overmolded inlet tube tapers to zero along the tapered inner surface portion of the connector.

49. The optical fiber connector of claims 47-48, wherein the overmolded inlet tube is constructed of a flexible plastic material that is more flexible than the connector.

50. The optical fiber connector of claims 47-49, wherein the overmolded inlet tube tapers to zero along the tapered inner surface portion of the connector and defines a needle-lock zone on the downward tapered inner surface of the location where the inlet tube tapers to zero.

51. The optical fiber connector of claims 47-50, wherein the retaining member defines a circumferentially extending pin.

52. The optical fiber connector of claims 47-51, wherein the overmolded inlet tube is zero-tapered along the tapered inner surface portion of the connector and the tapered inner surface of the connector defines a mold pin closure zone forming the zero-taper and a pin closure zone on the descending tapered inner surface of the location where the inlet tube is zero-tapered.

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